I had a socket 478 motherboard PC in the shop about a month ago.
IMHO, the mechanical mounting scheme is poor.
There is a picture of your motherboard at
http://www.hardocp.com/image.html?image=MTA1MjgwNzQ2NFl0b1FOMU80VmtfMV81X2wuanBn

There are 4 plastic "towers" that engage the spring clamps on the heatsink 
retainer. The plastic at the engagement points is very fragile. If one 
cracks or breaks you will loose the tight contact between the heatsink and 
the cpu.  In my example the heatsink simply fell to the base of the machine 
with the fan running. The fan monitor indicated all was well and proceeded 
to toast the cpu. The fragile plastic mount is easy to find and easy to 
replace. It must happen a lot! I believe I paid about $5. It replaces with 
"push-pull button" latches. I replaced the MB/heatsink/cpu for about $100 
(parts) for my customer.

It hope the heat has not destroyed your CPU. They are pretty pricey for the 
cpu alone.
I never use any adhesive between the heatsink and the cpu. Thermal grease is 
a better choice.

Also, the heatsink fans do go intermittent. Those tiny fans cost $4 across 
the counter.
John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US

----- Original Message ----- 
From: "WH Tan" <whsiung.my@gmail.com>
To: "PIC List" <PICLIST@mit.edu>
Sent: Sunday, June 04, 2006 12:16 PM
Subject: Fwd: [OT]: Dying PC... need some services!


> Dear all,
>
> I am quite desperate at the moment... :)  if I didn't fix this fast, a
> disaster might follow.
>
> The board is Intel Desktop Board D865PERL, the fan is C33218-002.  The
> dust are accumulated there on the heatsink.  It has caused
> (I think so) the PC to shut off in sudden, twice so far.  I haven't
> notice the first time but when it happened the 2nd time, I read
> something like "thermal overheat" in the reboot message.
>
> Now the problem is I could not find a manual on how should I
> disassembly the fan + heatsink... All I can get it some catalog +
> product specification on Intel site.
>
> Anyone know where can I find the manual, or is there any way better
> than my plan (to dissemble the fan) ?
>
>
> Thanks & best regards,
>
>
> --
> WH Tan
>
>
> PS: Hopefully I could read a reply before the PC was down permanently :)
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 


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